iOS 10.0.3

iOS 10.0.3 fixes bugs including an issue where some users could temporarily lose cellular connectivity.

For information on the security content of this update, please visit this website: https://support.apple.com/kb/HT201222

Reasons :

A growing number of Verizon subscribers are complaining about a serious issue that causes them to regularly lose LTE connectivity on their iPhone 7 and iPhone 7 Plus devices, suggesting a major bug that needs to be resolved by either Apple or Verizon. “Mac Rumors”

Complaints about call connection problems with Apple Inc.’s iPhone 7 models are spreading across social media in China just weeks after the devices were released. “Bloomberg”